4E50

Calmodulin and Ng peptide complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.241 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis for the interaction of unstructured neuron specific substrates neuromodulin and neurogranin with calmodulin

Kumar, V.Chichili, V.P.R.Zhong, L.Tang, X.Velazquez-Campoy, A.Sheu, F.-S.Seetharaman, J.Gerges, N.Z.Sivaraman, J.

(2013) Sci Rep 3: 1392-1392

  • DOI: 10.1038/srep01392
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Neuromodulin (Nm) and neurogranin (Ng) are neuron-specific substrates of protein kinase C (PKC). Their interactions with Calmodulin (CaM) are crucial for learning and memory formation in neurons. Here, we report the structure of IQ peptides (24aa) of ...

    Neuromodulin (Nm) and neurogranin (Ng) are neuron-specific substrates of protein kinase C (PKC). Their interactions with Calmodulin (CaM) are crucial for learning and memory formation in neurons. Here, we report the structure of IQ peptides (24aa) of Nm/Ng complexed with CaM and their functional studies with full-length proteins. Nm/Ng and their respective IQ peptides are intrinsically unstructured; however, upon binding with CaM, IQ motifs adopt a helical conformation. Ser41 (Ser36) of Nm (Ng) is located in a negatively charged pocket in the apo CaM and, when phosphorylated, it will repel Nm/Ng from CaM. These observations explain the mechanism by which PKC-induced Ser phosphorylation blocks the association of Nm/Ng with CaM and interrupts several learning- and memory-associated functions. Moreover, the present study identified Arg as a key CaM interacting residue from Nm/Ng. This residue is crucial for CaM-mediated function, as evidenced by the inability of the Ng mutant (Arg-to-Ala) to potentiate synaptic transmission in CA1 hippocampal neurons.


    Organizational Affiliation

    Department of Biological Sciences, National University of Singapore, Singapore.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Calmodulin, Linker, IQ motif of Neurogranin
A
185Mus musculusMutation(s): 0 
Gene Names: Calm2 (Cam2, CamC), Nrgn
Find proteins for P0DP27 (Mus musculus)
Go to UniProtKB:  P0DP27
Find proteins for P60761 (Mus musculus)
Go to UniProtKB:  P60761
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.241 
  • Space Group: P 41
Unit Cell:
Length (Å)Angle (°)
a = 76.467α = 90.00
b = 76.467β = 90.00
c = 46.955γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling
HKL-2000data collection
REFMACrefinement
SHELXSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-03-20
    Type: Initial release
  • Version 1.1: 2017-06-28
    Type: Source and taxonomy